package sesi.ejava.stream;

import java.util.Set;

import sesi.ejava.bcam.R;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

public class ListDevices extends Activity {

	public static String EXTRA_DEVICE_ADDRESS = "device_address";

	private BluetoothAdapter bluetoothAdapter;
	private ArrayAdapter<String> pairedDevicesArrayAdapter;
	private ArrayAdapter<String> newDevicesArrayAdapter;

	// The on-click listener for all devices in the ListViews
	private OnItemClickListener deviceClickListener = new OnItemClickListener() {
		public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
			// Cancel discovery because it's costly and we're about to connect
			bluetoothAdapter.cancelDiscovery();

			// Get the device MAC address, which is the last 17 chars in the
			// View
			String info = ((TextView) v).getText().toString();
			String address = info.substring(info.length() - 17);

			// Create the result Intent and include the MAC address
			Intent intent = new Intent();
			intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

			// Set result and finish this Activity
			setResult(Activity.RESULT_OK, intent);
			finish();
		}
	};

	// The BroadcastReceiver that listens for discovered devices and
	// changes the title when discovery is finished
	private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();

			// When discovery finds a device
			if (BluetoothDevice.ACTION_FOUND.equals(action)) {
				// Get the BluetoothDevice object from the Intent
				BluetoothDevice device = intent
						.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

				// If it's already paired, skip it, because it's been listed
				// already
				if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
					newDevicesArrayAdapter.add(device.getName() + "\n"
							+ device.getAddress());
				}
				// When discovery is finished, change the Activity title
			} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED
					.equals(action)) {
				setTitle(R.string.txtSelectDevice);
				if (newDevicesArrayAdapter.getCount() == 0) {
					String noNewDevices = getResources().getText(
							R.string.txtNoNewDevices).toString();
					newDevicesArrayAdapter.add(noNewDevices);
				}
			}
		}
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.device_list);

		// Initialize array adapters. One for already paired devices and
		// one for newly discovered devices
		pairedDevicesArrayAdapter = new ArrayAdapter<String>(this,
				R.layout.device_name);
		newDevicesArrayAdapter = new ArrayAdapter<String>(this,
				R.layout.device_name);

		// Find and set up the ListView for paired devices
		ListView pairedListView = (ListView) findViewById(R.id.paired_devices);
		pairedListView.setAdapter(pairedDevicesArrayAdapter);
		pairedListView.setOnItemClickListener(deviceClickListener);

		// Find and set up the ListView for newly discovered devices
		ListView newDevicesListView = (ListView) findViewById(R.id.new_devices);
		newDevicesListView.setAdapter(newDevicesArrayAdapter);
		newDevicesListView.setOnItemClickListener(deviceClickListener);

		// Initialize the button to perform device discovery
		Button scanDevicesButton = (Button) findViewById(R.id.buttonScanDevices);
		scanDevicesButton.setOnClickListener(new OnClickListener() {
			public void onClick(View view) {
				discoverDevices();
				view.setVisibility(View.GONE);
			}
		});

		// Register for broadcasts when a device is discovered
		IntentFilter broadcastFilter = new IntentFilter(
				BluetoothDevice.ACTION_FOUND);

		this.registerReceiver(broadcastReceiver, broadcastFilter);

		// Register for broadcasts when discovery has finished
		broadcastFilter = new IntentFilter(
				BluetoothAdapter.ACTION_DISCOVERY_FINISHED);

		this.registerReceiver(broadcastReceiver, broadcastFilter);

		bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
		Set<BluetoothDevice> pairedDevices = bluetoothAdapter
				.getBondedDevices();

		if (pairedDevices.size() > 0) {
			findViewById(R.id.txtPairedDevices).setVisibility(View.VISIBLE);
			for (BluetoothDevice device : pairedDevices) {
				pairedDevicesArrayAdapter.add(device.getName() + "\n"
						+ device.getAddress());
			}
		} else {
			String noPairedDevices = getResources().getText(
					R.string.txtNoPairedDevices).toString();

			pairedDevicesArrayAdapter.add(noPairedDevices);
		}
	}

	@Override
	protected void onStart() {
		super.onStart();

	}

	@Override
	protected void onDestroy() {
		super.onDestroy();

		// Make sure we're not doing discovery anymore
		if (bluetoothAdapter != null) {
			bluetoothAdapter.cancelDiscovery();
		}

		// Unregister broadcast listeners
		this.unregisterReceiver(broadcastReceiver);
	}

	private void discoverDevices() {
		setTitle(R.string.scanning);

		// Turn on sub-title for new devices
		findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);

		// If we're already discovering, stop it
		if (bluetoothAdapter.isDiscovering()) {
			bluetoothAdapter.cancelDiscovery();
		}

		// Request discover from BluetoothAdapter
		bluetoothAdapter.startDiscovery();
	}

}
